Stress analysis of short implants assisting partial overdenture with two types of attachment for maxillary kennedy class I

Abstract

Purpose This study’s goal was to figure out how much stress is placed on nearby short implants using two types of attachment for assisting partial overdenture for maxillary Kennedy Class I. Materials and methods To assess the microstrains caused by the short implant, this in-vitro study employed strain gauge technology using two types of attachment for assisting partial overdenture for maxillary Kennedy Class I. Five epoxy resin models in each group in the position of the first molar in both sides was implanted into different groups, group A: one implant 5 mm length with 4.8 mm diameter, group B: one implant 5 mm length with 6.2 mm diameter. A ball and socket attachment was implanted in the left side and a locator attachment was placed in the right side of the implant. The force is directed vertically by the post of the universal testing machine. 1. The loading device base and a static 200 N vertical load measurement in a horizontal plane. 2. Oblique load measurement: A static 40 N oblique load was applied to the surface of a wooden segment that was oblique and made an angle of 45° with the applied force. To guarantee the repeatability of the data, the load was applied six times for each model, vertically and obliquely, with a minimum of five minutes between measurements. Results Total microstrain measured around implants with locator attachments on vertical and oblique load in group A was greater than group B, as was total microstrain measured around implants with ball and socket attachment on vertical and oblique load in group A. Total microstrain recorded around small diameter implants in group A were higher than total microstrain recorded around wide diameter implants in group B on vertical and oblique load. Conclusions The higher strain was recorded around implants with ball attachments than implants with locator attachments. Regarding to microstrain recorded in each group under vertical and oblique load, using wide diameter short implants is better as less microstrains were recorded.